MBX_0_THRU_6
mcp->in_mb = MBX_0_THRU_6;
mcp->out_mb = MBX_0_THRU_6;
mcp->in_mb = MBX_0_THRU_6;
mcp->out_mb = MBX_0_THRU_6;
mcp->out_mb = MBX_0_THRU_6;
mcp->in_mb = MBX_0_THRU_6;
#define MBX_0_THRU_7 MBX_0_THRU_6 | MBX_7